Raceblade Fixings

I've put some Raceblades on my Bianchi, currently with the rubber straps so I can easily take them off on dry days and for cleaning. Are these straps any good, or should I use the cable ties? I have visions of it popping off and planting the guard in my wheel.

Similar to what andy said.
Make sure you protect your frame.
The first time I used mine on my Tricross (gloss black paint), they scratched the frame on the seat stays such that I had to T-cut it to remove the scratches. I guess they were moving around very slightly, and when the grit got under them the damage was done.
I now use cut up pieces of inner tube under the brackets and it works fine.